CBSE
Multiple Choice QuestionsThe treatment of benzene with isobutene in the presence of sulphuric acid gives
iso -butyl benzene
tert -butyl benzene
n -butyl benzene
no reaction
Assertion : Addition of HBr on 2-butene gives two isomeric products.
Reason: Addition of HBr on 2-butene follows Markovnikov's rule.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.
Assertion : Alkyl isocyanides in acidified water give alkyl formamides.
Reason : In isocyanides, carbon first acts as a nucleophile and then as an electrophile.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion : p-O2N- C6H5COCH3 is prepared by Friedel Crafts acylation of nitrobenzcne.
Reason : Nitrobenzene easily undergoes electrophilic substitution reaction.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The main component of marshgas is :
methane
ethane
butane
isobutane
Action of acetylene on dilute H2SO4 gives :
acetic acid
acetaldehyde
acetone
acetoacetic ester
Assertion : Cyclopentadienyl anion is much more stable than allyl anion.
Reason : Cyclopentadienyl anion is aromatic in character.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Which is the best reagent to distinguish between propene and propyne ?
ammonical AgNO3
alkaline KMnO4
aqueous Br2
The octane number of a sample of petrol is 40 .It means that its knocking property is equal to the mixture of :
40% n-heptane + 60% iso-octane
40% petrol + 60% iso-octane
60% n-heptane + 40% iso-octane
60% petrol + 40% iso-octane
Assertion: The presence ofnitro group facilitates nucleophilic substitution reactions in aryl halides.
Reason: The intermediate carbanion is stabilised due to the presence of nitro group.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.
